From the book

From the book

Use the Color Replacement tool to paint over one color with another. When you start painting with the Color Replacement tool,
it analyzes the first pixels you paint over. Because it then only replaces pixels of a similar color, you don’t have to be
terribly precise as you paint. You can select settings that determine whether the tool paints over contiguous or discontiguous
pixels, and how much color difference the tool accepts.

You’ll use the Color Replacement tool to change the color of the child’s cap in the image of the playground.

Move the Size slider to 15 pixels, the Hardness slider to 40%, and the Spacing slider to 25%. Choose Off from the Size and Tolerance menus.

Click outside the Brush pop-up panel to close it.

In the options bar, choose Hue from the Mode menu. Then click Sampling: Continous () (the button next to the Hue menu). Choose Find Edges from the Limits menu, and set the Tolerance to 32%. Make sure Anti-Alias is selected.

Begin painting in the middle of the hat, and paint out toward the edges.